Apple M2 Ultra meets the minimum VRAM requirement for Q4 inference of mlx-community/gpt-oss-20b-MXFP4-Q8. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
Apple M2 Ultra can run mlx-community/gpt-oss-20b-MXFP4-Q8 with Q4 quantization. At approximately 60 tokens/second, you can expect Good speed - acceptable for interactive use.
You have 182GB headroom, which is sufficient for system overhead and smooth operation.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 10GB | 192GB | 59.65 tok/s | ✅ Fits comfortably |
| Q8 | 20GB | 192GB | 44.95 tok/s | ✅ Fits comfortably |
| FP16 | 41GB | 192GB | 24.13 tok/s | ✅ Fits comfortably |